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The 2ah Ryobi Li-Ion battery sells for $25, alone.

RYOBI introduces the USB Lithium Rotary Tool. The rotary tool features a compact design that delivers more power for any application. The new innovative Quick-Change Collet with 4X faster accessory changes, which makes switching accessories quick and easy. This kit comes with 15 accessories for a variety of applications such as carving, sanding, polishing and more. The USB Lithium Rotary Tool is a part of the USB Lithium System that provides compact, portable, rechargeable solutions for cordless power and productivity.